How do you swap slots safely?

Short answer: Deploy the new version to a staging slot. Test thoroughly using the staging URL. Swap staging → production via Azure Portal, CLI, or PowerShell. Example using Azure CLI: az webapp deployment slot swap \ -resource-group MyResourceGroup \ -name MyAppService \ -slot staging \ -target-slot production

Real-world example (ShopNest)

ShopNest on Azure typically uses App Service + SQL Database + Blob Storage + Application Insights for monitoring.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.